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Objects: The Stuff You Want
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In prior versions, the owner of an object always had implicit permission to change the DACL on an object. Many administrators requested the ability to change this behavior so that users could not change permissions on their own files. This functionality is provided in Windows Vista and Windows Server 2008 through the OWNER_RIGHTS SID. If the OWNER_RIGHTS SID is applied to the object, it will supersede the implicit rights of owners. Therefore, placing an OWNER_RIGHTS ACE for modify permissions on an object effectively means the owner cannot change the permissions on the object. If the owner is replaced on the object, the OWNER_RIGHTS ACE is set to inherit-only, even if it is on a file. This effectively disables the ACE until the administrator can make sure that the permissions do not block everyone out.
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User Rights and Privileges
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We have alluded to one final aspect of access control several times, but never fully explained it: user rights and privileges. User rights and privileges are often used interchangeably. However, they are in fact very different constructs. User rights only govern the methods by which a user can log on. Privileges, however, determine what users can do after they have logged on. You saw privileges in a token in Figures 3-10 and 3-11. Privileges are managed in Group Policy under the User Rights Assignment node, shown in Figure 3-15.
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Figure 3-15 You can manage privileges in Group Policy.
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In many tools such as the tokens shown in Process Explorer privileges show up in a different format than they do in Group Policy. Table 3-7 shows both strings for all privileges,
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along with an explanation of what the privilege means. Bolded privileges in Table 3-7 are extremely sensitive privileges that give the holder very advanced rights on the computer.
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Table 3-7
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Privileges in Windows Server 2008
Friendly Name Replace a process level token Description Permits the holder to assign a new token to any process. This privilege can be quite sensitive if held in conjunction with a privilege that permits the holder to obtain a process token. Permits the holder to create arbitrary security event log events. An attacker can use this to insert arbitrary data into the event log. Permits the holder to access all parts of any file or object, regardless of the ACL on the object. In other words, it grants read access to any object. This privilege is enabled for all users. It causes the system to permit traversal through directory hierarchies that the user does not have access to. As the name implies, it also permits the user to receive notifications of changes to a securable object. Permits the holder to create objects such as symbolic links in an object manager namespace assigned to a different session. Grants the holder the right to create a pagefile. A permanent object is not deallocated when it is no longer needed by anyone. This privilege is somewhat sensitive in that it could permit a malicious user to consume resources on the computer, as well as pre-create objects on which more sensitive processes rely. The ability to create symbolic links has long been a source of vulnerabilities in Unix-based operating systems. A malicious user can create a symbolic link with the same name as an operating system binary, but that points to a malicious program. If an administrator executes the symbolic link the malicious code would run, not the intended operating system binary. To mitigate that risk Windows includes this privilege.
Constant/value SeAssignPrimaryTokenPrivilege
SeAuditPrivilege
Generate security audits
SeBackupPrivilege
Back up files and directories
SeChangeNotifyPrivilege
Bypass traverse checking
SeCreateGlobalPrivilege
Create global objects Create a pagefile Create permanent shared objects
SeCreatePagefilePrivilege SeCreatePermanentPrivilege
SeCreateSymbolicLinkPrivilege
Create symbolic links
3:
Objects: The Stuff You Want
Table 3-7
Privileges in Windows Server 2008
Friendly Name Create a token object Description This is a highly sensitive privilege that permits the user to create security tokens for arbitrary users with arbitrary group membership. A subject holding this privilege can become any other user on the computer. This is one of the most sensitive privileges in the operating system. It permits the holder to debug any process, including those belonging to other users. Using this privilege the holder can inject code into another process and have it execute in the context of the subject that started that process. This is, for example, how all the programs that dump password hashes work. This is another very sensitive privilege, but only in a domain environment. It enables the holder to configure accounts that are trusted for delegation. Accounts that are trusted for delegation can create security tokens. Permits the holder to create an impersonation token for a user. A few years ago a common attack was to set up a named pipe with a name similar to a common share. When a user is connected to the pipe the malicious program that created it could impersonate the user and take any action the user could. In Windows Server 2008 only a subject holding the SeImpersonatePrivilege can carry out the impersonation step.
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